package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.BooleanUtil;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collections;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock {

    private String name;
    private StringRedisTemplate stringRedisTemplate;

    private static final String KEY_PREIX= "lock:";
    private static final String ID_PREIX= UUID.randomUUID().toString();

    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;

    static {
        UNLOCK_SCRIPT = new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("/redis-lua/unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }

    public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean tryLock(long timeoutSec) {
        String threadId = ID_PREIX + Thread.currentThread().getId();
        Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREIX + name, threadId+"", timeoutSec, TimeUnit.SECONDS);
        return BooleanUtil.isTrue(success);
    }

//    @Override
//    public void unlock() {
//        String redisLock = stringRedisTemplate.opsForValue().get(KEY_PREIX + name);
//        String threadId = ID_PREIX + Thread.currentThread().getId();
//        if (redisLock.equals(threadId)){ //判断是否是当前线程
//            stringRedisTemplate.delete(KEY_PREIX + name);
//        }
//    }

    @Override
    public void unlock() {
        //调用Lua脚本
        stringRedisTemplate.execute(
                UNLOCK_SCRIPT,
                Collections.singletonList(KEY_PREIX + name),
                ID_PREIX + Thread.currentThread().getId()
                );
    }
}
